Gigablast high number of corrected errors

So I subscribed to Gigablast, but am only getting about 250mbps down. I'm using the SB8200 modem. The signal levels look ok, however i get an extremely high number of corrected errors. Hundreds of millions after 30 minutes of resetting the modem. Looking up on how these errors are corrected, it would appear there are so many packets that need to be corrected, that it's bottlenecking my bandwidth trying to correct them. See image below.

Am I correct in this assessment?

It should also be noted that a tech came out and said he will be replacing the line to my apartment this week and see if that's the issue.

Just looking to get an opinion that may be more knowledgeable than mine.

Signal levels look good. That channel is to communicate the D3.1 channels, and has a different modulation. I think I heard that growing pains of D3.1 coming out is correctables on the OFDM like seen here. It shouldn't be service effecting to the extent. Some minor latency maybe, but not 250Mbps.

Are you connecting direct to the modem? If so, what test are you using to test? I prefer DSLReports. Please paste the link of the results in he reply so I can fully review it.

Yes, I've hooked to the modem directly with the same results. The tech that came out also hooked his laptop with the same results, ruling out my router / computer. He also hooked up his little device that tests the speeds, and showed the coax port I am using being capable of 750mbps. So idk.

What's weird is I had ultimate before Gigablast, and was getting daily results of 350 down. When I went in to the cox solutions store and said I wanted Gigablast, he put in a work order and said just call with my modems (sb8200) mac and serial and I should be good. Before I even had a chance to buy the modem and call them, my speeds dropped. Which makes me think it's an account issue. But customer service swears everything on the account is Ok.

When running on speedtest.net to the cox server, it will boost to 500mbps for the first second or two, then throttle back down to 250-200 mbps for the rest of the test. Like cox thinks I'm still on ultimate.